Copy and Redirecting System.err Stream

Question

I am currently using java.util.logger in my application. It sends its output to System.err. I need it to continue to do this, but I also need to send that output to something else.

Is there a way to copy the System.err stream so that it can send to two different sources?

Answer 1

As always when note people referencing java.util.logger I feel inclined to at least recommend looking at another logging library, such as logback and slf4j.

This blog post describes a method which can easily be adapted to support what you're asking for. In short what you need to do is define a PrintStream which can duplicate its output, assign this using:

System.setErr(doubleLoggingPrintStream)